Mimo,
We sound like we are having similar problems..the only thing that we havent done yet is to put one of those gates at the bottom on her doorway so she cant run around the house at night. If I tell Eliza to go back to bed or even try and take her back it is horrid she goes hysterical. It is easier to have 3 in the bed.
I'm sure it is a stage of pushing boundries BUT it is funny because we have no problems through the day either
Bec